Modernise 'cylc dump -t' print format. #8214

Job	Run time
1/4	13m 5s
2/4	11m 49s
3/4	12m 6s
4/4	16m 35s
py-3-latest	20m 14s
flaky	6m 2s
_remote_background_indep_poll	4m 55s
_remote_background_indep_tcp	7m 1s
macos 1/5	17m 31s
macos 2/5	18m 9s
codecov	37s
	2h 8m 4s

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